JPH07323654A - Transfer of electrodeposition image - Google Patents

Abstract

PURPOSE:To prevent the occurrence of deficiency accompanying the falling-off of an electrodeposition image by using a support base material having a pressure-sensitive adhesive layer having strong adhesive strength provided there to and peeling the electrodeposition image from a metal plate while preventing the falling-off thereof to transfer the same to the support base material. CONSTITUTION:When a random character for a timepiece is transferred to a display plate for a timepiece as an electrodeposition image, at first, a negative or positive photo-film 1 for an electrodeposition image is formed by photographing or printing. Next, the film 1 is placed on a metal plate 5 through a photoresist 6 and exposed to be developed and the unexposed photoresist 6 is removed to form conductive parts 7 having the shapes of an objective image drawing and a guide image drawing on the surface of the metal plate 5. Subsequently, a metal is precipitated on the conductive parts 7 by an electrodeposition method to form electrodeposition images 8, 9 which are, in turn, bonded to the pressure-sensitive adhesive layer 11 provided on a support base material 10 and peeled from the metal plate 5 to be transferred to the support base material.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention forms an image of, for example, rose letters for clocks or decorative parts on the surface of a metal plate by an electrodeposition method, and peels this image (electrodeposition image) from the metal plate to form a film. The present invention relates to a method for transferring an electro-deposited image, which is transferred to a support substrate such as a film, and then transferred to an adherend such as a timepiece display plate.

[0002]

2. Description of the Related Art Recently, for an article having a minute and complicated shape such as a rose character for a watch or a decorative part, a conductive portion is formed on the surface of a metal plate along the shape of these images. Then, a metal is deposited on the conductive portion by an electrodeposition method to form an electrodeposited image of the metal thin film, and the electrodeposited image is temporarily transferred to a supporting base material such as a film via an adhesive and held. rear,
It is widely practiced to transfer this electro-deposited image to an adherend such as a timepiece display plate while peeling it from a supporting base material via an adhesive.

Here, when the electrodeposition image formed on the surface of the metal plate is peeled from the metal plate and transferred to and held on a supporting base material, the electrodeposition image is prevented from dropping and a defect is prevented. For this purpose, it is desirable to provide an adhesive having a strong adhesive force on the surface of the supporting base material and transfer the electrodeposition image to the supporting base material through the adhesive.

However, when a supporting base material having an adhesive having a strong adhesive force is used and the electrodeposition image is transferred and held on the supporting base material, the supporting base material is Since the adhesive force (holding force) with respect to the electrodeposition image is considerably large, it becomes difficult to adhere the electrodeposition image to the adherend while peeling the electrodeposition image from the supporting base material.

Therefore, conventionally, an adhesive having a weak adhesive force is adhered to a supporting base material such as a tape, and the electrodeposition image is held on the supporting base material through the weak adhesive, and the electrodeposition image is held. An adhesive having a strong adhesive force is applied to the back surface side of the sheet, that is, the side exposed when transferred to the supporting base material, and the adhesive force on the front and back surfaces of the electro-deposited image causes the adhesive strength of the adhesive material to decrease. It is widely practiced to peel off a deposited image and attach it to an adherend (see, for example, JP-A-59-140384).

As a method of applying the adhesive only to the back surface of the electro-deposited image, a throw-away electro-deposit for preventing excessive electro-deposition is provided at the outer peripheral edge of a letter or the like, and the throw-away electro-deposit is adhered to the letter or the like. After being used as a mask for painting, the discarded electrodeposit is thrown away (see, for example, Japanese Examined Patent Publication No. 63-1).
(See Japanese Patent No. 8674) or a mask having an opening slightly larger than the electrodeposition image, and the mask is used to cover the periphery of the electrodeposition image transferred from the metal plate to the supporting base material such as a sheet. There has been proposed one in which an adhesive is applied in such a state (see, for example, Japanese Patent Publication No. 4-43988).

[0007]

However, as in the above-mentioned conventional example, a supporting base material to which an adhesive having a weak adhesive force is attached is used to peel and hold an electrodeposition image formed on a metal plate. Then, due to this lack of adhesive force, the electrodeposited image is likely to fall off and defects are likely to occur, and in order to prevent this, if a supporting base material to which an adhesive having strong adhesive force is attached is used, At present, it is difficult to separate the electrodeposited image from the supporting base material, and both of these cannot be satisfied.

It should be noted that strong plating release treatment is applied to the surface of the metal plate, and an electrodeposition image is formed on the metal plate to transfer the electrodeposition image to a film or the like with an adhesive having a weak adhesive force. Although it is conceivable, in such a case, the electroplated image will drop off from the metal plate due to the plating stress generated during electrodeposition.

Moreover, even though the adhesive strength is weak, the adhesive strength is sufficient for peeling and holding the electrodeposited image from the metal plate, so that this adhesive remains on the surface of the electrodeposited image. Not only does the adhesive residue phenomenon occur, but the above Japanese Patent Publication No. 63-
As described in Japanese Patent No. 18674 and Japanese Patent Publication No. 4-43988, it is necessary to apply an adhesive only to the back surface side of the electrodeposition image.

In view of the above, the present invention can transfer an electrodeposition image formed on the surface of a metal plate to an adherend by using a supporting base material to which an adhesive having a strong adhesive force is attached. Moreover, it is an object of the present invention to provide a product capable of simplifying the process by eliminating the troublesome work of applying an adhesive only on the back surface of the electrodeposition image.

[0011]

In order to achieve the above object, a method for transferring an electro-deposited image according to the present invention comprises a support substrate having a pressure-sensitive adhesive layer formed by forming an electro-deposition image on the surface of a metal plate. After the electrodeposition image is attached to the pressure-sensitive adhesive layer of the material and peeled and transferred from the metal plate to reduce the adhesive force of the pressure-sensitive adhesive layer,
For example, a fixing adhesive having stronger adhesion than the pressure-sensitive adhesive layer is applied to the entire surface of the supporting substrate on the electrodeposition image holding side, and the electrodeposition is performed via the fixing adhesive. It is characterized in that the image is peeled from the supporting base material and attached to the surface of the adherend.

Here, the decrease in the adhesive force of the pressure-sensitive adhesive layer is caused by forming a pressure-sensitive adhesive layer with an ultraviolet-curing type adhesive and irradiating it with ultraviolet rays, or pressure-sensitive with a heat-curing type adhesive. It can be carried out by forming an adhesive layer and heating it, or by forming a pressure-sensitive adhesive layer with a time-curable adhesive and giving a change over time.

[0013]

According to the present invention configured as described above, a pressure sensitive adhesive layer having a strong adhesive force is provided on a supporting substrate, and an electrodeposition image formed on a metal plate by the pressure sensitive adhesive layer is formed. Transferring to the supporting substrate while peeling from the metal plate, in this state, by reducing the adhesive force of the pressure-sensitive adhesive, it becomes the same state as holding the electrodeposition image with a weak adhesive. ,
The electrodeposition image can be adhered to the surface of the adherend while being peeled off from the supporting base material via the fixing adhesive applied to the supporting base material on the electrodeposition image holding side.

Moreover, the bonding force at the interface between the pressure-sensitive adhesive layer and the fixing adhesive after the adhesive force is reduced is
By selecting both adhesives so as to be larger than the bonding force at the interface between the adherend and the fixing adhesive, the fixing adhesive is applied to the entire surface of the supporting base material on the electrodeposition image holding side. be able to.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. This embodiment shows an example in which rose characters for a watch are used as an electro-deposited image and transferred to the surface of a watch display plate (adherend). First, as shown in FIG. Negative or positive electrodeposited photo film 1
To create a photo or print.

What is shown in the figure is a positive film,
The film 1 has a target image FIG. 2 constituting roses 3, 6, 9 and 12 for a watch, and a rectangular frame-shaped guide image FIG. 3 surrounding the target image FIG. (Indicated by diagonal lines in FIG. 3) is drawn in black ink or the like, and the guide mark 4 is drawn in a white space at a predetermined position inside the guide image FIG.

On the other hand, as shown in FIG. 2, a photoresist 6 such as a liquid resist, a dry film resist or a printing resist ink is applied on the upper surface of a metal plate 5 such as stainless steel and baked. Have it ready.

Then, as shown in FIG. 3, the metal plate 5 is
The film 1 is placed with the photoresist 6 interposed therebetween, and exposure is performed by an exposure device or the like in this state (in the figure, the hatched portion in the film 1 is the target image FIG. 2 and the guide image). This is a portion that blocks light corresponding to the image shown in FIG. 3).

After this exposure, development is performed to remove the unexposed photoresist 6a (see FIG. 3), whereby the target image FIG. 2 and the guide image are formed on the surface of the metal plate 5 as shown in FIG. The conductive portion 7 having a shape according to the shape in FIG. 3 is formed.

Next, as shown in FIG. 5, a metal is deposited on the conductive portion 7 by an electrodeposition method (electrodeposition image method),
An electrodeposition image 8 having a shape according to the shape of the target image FIG. 2,
Guide image An electrodeposition image 9 having a shape shown in FIG. 3 is formed of a metal thin film.

The electrodeposited image 8 has the numbers 3, 6, 9 or 12 when viewed from the plane, but it is drawn as having these widths in the drawing. Also,
Inside the electro-deposited image 9, a guide hole (not shown) penetrating along the shape of the guide mark 4 is formed.

If, for example, nickel is used as the metal forming the electrodeposition images 8 and 9, nickel sulphate solution is used as the Watt's solution to deposit nickel on the conductive portion 7. The electrodeposition conditions at this time are, for example, to obtain an electrodeposition image of 100 μm ± 10 μm in 3 hours by applying a current of 3 A / dm ² to an electrodeposition effective area of 150 mm × 150 mm. You can

In addition to nickel, gold, silver, copper,
Needless to say, any metal such as iron or alloy may be deposited on the conductive portion 7 to form an electrodeposition image, and by changing the electrodeposition conditions, for example, 20 to 300 μm.
An electrodeposited image having an arbitrary thickness can be obtained within the range of the order.

Next, as shown in FIG. 6, after the photoresist 6 on the metal plate 5 is removed by immersing it in a solution, the surface of the electrodeposited images 8 and 9 is subjected to a surface treatment, if necessary. It is possible to apply the metal plating, the electrodeposition coating, the spray coating, the printing, the electrostatic coating, the vacuum deposition, and other decorations (coloring).

In this way, the metal plate 5 is formed by the electrodeposition method.
After forming the electro-deposited images 8 and 9 along the desired shape on the surface of, the electro-deposited images 8 and 9 are transferred to a supporting substrate 10 such as a film as shown in FIG. At this time, a pressure-sensitive adhesive layer 11 that has a strong adhesive force and that changes to a weak adhesive force due to energy application or aging is provided on one surface of the supporting base material 10. The electrodeposited images 8 and 9 are attached to and peeled from the metal plate 5.

As described above, the electrodeposited images 8 and 9 are formed on the surface of the metal plate 5 by transferring the electrodeposited images 8 and 9 from the metal plate 5 to the supporting substrate 10 through the pressure sensitive adhesive layer 11 having a strong adhesive force. It is possible to prevent the electrodeposited images 8 and 9 from falling off when peeling the electrodeposited images 8 and 9 from the metal plate 5 and holding the electrodeposited images 8 and 9 to prevent the occurrence of defects.

The pressure-sensitive adhesive layer 11 can be formed of, for example, a UV-curable pressure-sensitive adhesive, a heat-curable pressure-sensitive adhesive, or a time-curable pressure-sensitive adhesive. Here, as a typical example of the ultraviolet-curable pressure-sensitive adhesive, a photopolymerizable compound such as an addition polymerizable compound having two or more unsaturated bonds or an alkoxysilane having an epoxy group, a carbonyl compound or an organic sulfur compound, Examples thereof include a rubber pressure-sensitive adhesive compounded with a photopolymerization initiator such as a peroxide, an amine and an onium salt compound, and an acrylic pressure-sensitive adhesive agent (JP-A-60-1969).
56). The compounding amount of the photopolymerizable compound and the photopolymerization initiator is 10 to 50 per 100 parts by weight of the base polymer, respectively.
0 parts by weight and 0.1 to 20 parts by weight are common.

Acrylic polymers are customary (Japanese Patent Publication No. 57-54068, Japanese Patent Publication No. 58-339).
(See Japanese Patent Publication No. Sho 61-56264) as well as those having a radical-reactive unsaturated group in the side chain.
Alternatively, those having an epoxy group in the molecule can also be used.

Examples of the addition-polymerizable compound having two or more unsaturated bonds include polyhydric alcohol esters or oligoesters of acrylic acid or methacrylic acid, epoxy compounds and urethane compounds.

Further, an epoxy group-functional cross-linking agent having one or more epoxy groups in the molecule such as ethylene glycol diglycidyl ether can be additionally compounded to enhance the cross-linking effect.

When the pressure-sensitive adhesive layer 11 is formed by using an ultraviolet curable adhesive, it is necessary to use a transparent film or the like as the supporting substrate 10 in order to enable the ultraviolet irradiation treatment.

Typical examples of the heat-curable pressure-sensitive adhesive include polyisocyanate, melamine resin, amine-
A rubber system containing a cross-linking agent such as an epoxy resin, a peroxide or a metal chelate compound, and a cross-linking regulator composed of a polyfunctional compound such as divinylbenzene, ethylene glycol diacrylate or trimethylolpropane trimethacrylate, if necessary. Examples thereof include pressure sensitive adhesives and acrylic pressure sensitive adhesives.

Further, as a time-curable pressure-sensitive adhesive,
An example is one in which the adhesive force is lowered by evaporating the compounded solvent over time. Next, after the adhesive strength of the pressure-sensitive adhesive layer 11 is reduced, as shown in FIG. 8, the pressure-sensitive adhesive layer 11 is adhered to the entire surface of the supporting substrate 10 on the electrodeposition image holding side. A fixing adhesive 12 having a stronger adhesive force than the force is applied, for example, by spraying, and thereafter, an electrodeposition image 8, of the application surface of the fixing adhesive 12,
Release paper 13 is attached to the back side of 9 as required.

When the pressure-sensitive adhesive layer 11 is formed of an ultraviolet-curable pressure-sensitive adhesive, the support base material 10 has the electrodeposited images 8 and 9 from the surface side, that is, the electrodeposited image 8 is formed. By irradiating ultraviolet rays from the side opposite to the holding sides of the pressure sensitive adhesive layers 9 and 9, the adhesive force of the pressure-sensitive adhesive layer 11 is changed to an extremely weak adhesive force.

When the pressure-sensitive adhesive layer 11 is formed of a heat-curable pressure-sensitive adhesive, the supporting substrate 10 is heated to form a time-curable pressure-sensitive adhesive. In this case, the adhesive force of the pressure-sensitive adhesive layer 11 is changed to an extremely weak adhesive force by giving a change over time.

After the fixing adhesive 12 is applied to the holding side of the electrodeposited images 8 and 9 on the supporting substrate 10, the adhesive force of the pressure-sensitive adhesive layer 11 is reduced in the same manner as described above. May be.

Next, as shown in FIG. 9, the electrodeposition is carried out on the surface of a timepiece display plate 14 as an adherend through a fixing adhesive 12 applied to the electrodeposition image holding side of the supporting substrate 10. The images 8 and 9 are attached and fixed while being separated from the supporting base material 10.

Here, as shown in FIG. 10, a guide pin 16 is provided in a protruding manner on a holding plate 15 which holds the timepiece display plate 14, and the guide pin 16 and the electrodeposition image 9 are provided. The electrodeposition image 8 can be positioned with respect to the timepiece display plate 14 through the guide hole (not shown).

At this time, as described above, since the adhesive force of the pressure-sensitive adhesive layer 11 is lowered, it becomes the same state as that where the electro-deposited images 8 and 9 are held by the weak adhesive, and the support is performed. Attaching the electrodeposition image 8 to the surface of the timepiece display plate (adherend) 14 while peeling off the electrodeposition image 8 from the supporting base material 10 through the adhesive 12 applied on the electrodeposition image holding side of the base material 10. You can

The adhesive force at the interface between the pressure-sensitive adhesive layer 11 and the fixing adhesive 12 is the timepiece display plate 1
It is possible to prevent the fixing adhesive 12 from adhering to the timepiece display plate 14 by selecting both the adhesives 11 and 12 so as to be larger than the bonding force at the interface between the fixing adhesive 4 and the fixing adhesive 12. it can.

For example, when an acrylic pressure-sensitive adhesive containing a photopolymerizable compound and a photopolymerization initiator is used as the pressure-sensitive adhesive forming the pressure-sensitive adhesive layer 11, the adhesive 12 for fixing is used. , An adhesive of the same kind as the pressure-sensitive adhesive forming the pressure-sensitive adhesive layer 11, that is, an acrylic pressure-sensitive adhesive is used only as a base polymer containing no photopolymerizable compound and a photopolymerization initiator. After coating, by aging for 9 hours in an atmosphere of 40 ° C., the adhesive force at the interface between the pressure-sensitive adhesive layer 11 and the fixing adhesive 12 is higher than that of the timepiece display plate 14 and the fixing adhesive 12. It can be made larger than the bonding force at the interface with. Then, the adhesive other than the fixing portion can be peeled and removed without leaving.

It is also possible to use an arbitrary fixing adhesive 12 by applying the fixing adhesive 12 only to the back surface of the electrodeposited image 8 through a mask or the like.

[0043]

Since the present invention has the above-mentioned structure,
Using a supporting substrate provided with a pressure-sensitive adhesive layer having a strong adhesive force, the electrodeposition image formed on the surface of the metal plate is peeled from the metal plate while preventing the falling, and transferred to the supporting substrate. , This prevents the occurrence of defects due to the drop of the electrodeposited image, and reduces the adhesive strength of the pressure-sensitive adhesive layer, so that the electrodeposited image can be smoothly peeled from the supporting substrate and transferred to the adherend. Can be made.

In particular, by changing the adhesive force of the pressure-sensitive adhesive layer extremely weakly, the phenomenon of adhesive residue is prevented, and the electrodeposited image is more smoothly peeled from the supporting base material while being adhered to the adherend. Can be dressed.

Moreover, the bonding force at the interface between the pressure-sensitive adhesive layer and the fixing adhesive after the adhesive force is reduced is
By selecting both adhesives so as to be larger than the bonding force at the interface between the adherend and the fixing adhesive, the fixing adhesive is applied to the entire surface of the supporting substrate on the electrodeposition image holding side. The process can be simplified by eliminating the troublesome work of applying the adhesive only on the back surface of the electrodeposited image.

[Brief description of drawings]

FIG. 1 is a plan view showing an example of a photo film for electrodeposition image.

FIG. 2 is a cross-sectional view showing a state in which a photoresist is laminated on a metal plate.

FIG. 3 is a sectional view showing a state during exposure.

FIG. 4 is a cross-sectional view showing a state of development after exposure.

FIG. 5 is a cross-sectional view showing a state in which electrodeposition is performed after development.

FIG. 6 is a cross-sectional view showing a state in which the photoresist has been removed after electrodeposition.

FIG. 7 is a cross-sectional view showing a state in which an electrodeposition image is transferred and held on a supporting base material.

FIG. 8 is a cross-sectional view showing a state in which the adhesive force of the pressure-sensitive adhesive layer is reduced, a fixing adhesive is applied to the electrodeposition image holding surface side of the supporting base material, and then release paper is applied to the applied surface .

FIG. 9 is a cross-sectional view showing a state in which an electrodeposition image is transferred to an adherend.

FIG. 10 is a perspective view showing an adherend on which an electrodeposition image is transferred.

[Explanation of symbols]

 1 Photo Film for Electrodeposition Image 5 Metal Plate 6 Photoresist 7 Conductive Part 8, 9 Electrodeposition Image 10 Supporting Base Material 11 Pressure-Sensitive Adhesive Layer 12 Adhesive for Adhesion 14 Watch Display Plate (Adherent)

Claims (5)

[Claims] 1. An electrodeposition image is formed on the surface of a metal plate, and the electrodeposition image is affixed to the pressure-sensitive adhesive layer of a supporting substrate provided with a pressure-sensitive adhesive layer, and peeled and transferred from the metal plate, After reducing the adhesive force of the pressure-sensitive adhesive layer, apply a fixing adhesive having a stronger adhesive force than the adhesive force of the pressure-sensitive adhesive layer on the electrodeposition image holding side of the supporting substrate, A method for transferring an electro-deposited image, which comprises adhering the electro-deposited image to the surface of an adherend while peeling off the electro-deposited image from the supporting base material via the fixing adhesive. 2. The method for transferring an electro-deposited image according to claim 1, wherein the fixing adhesive is applied to the entire surface of the supporting substrate on the electro-deposited image holding side. 3. The pressure-sensitive adhesive layer is formed of an ultraviolet-curable pressure-sensitive adhesive, and the adhesive force of the pressure-sensitive adhesive layer is reduced by irradiating with ultraviolet rays. Transfer method of electro-deposited image. 4. The pressure-sensitive adhesive layer is formed of a heat-curable pressure-sensitive adhesive, and the adhesive force of the pressure-sensitive adhesive layer is reduced by heating. Transfer method of electro-deposited image. 5. The electrodeposition according to claim 1, wherein the pressure-sensitive adhesive layer is formed of a time-curable pressure-sensitive adhesive, and the adhesive force of the pressure-sensitive adhesive layer is reduced by aging. Image transfer method.